Conjugated Dyes

Longer chains, longer wavelengths

An interactive lesson with 5 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Conjugated π electrons behave like particles in a box.
• Longer conjugation → smaller gap → longer wavelength absorbed.
• ~10 conjugated C=C reach the visible (carrots, tomatoes).

Steps

1. Electrons on a longer track
2. Stretch the box
3. Carrot orange
4. Seeing in colour
5. Shrinking gap